Traction device



June 27, 1933. R. L. VAN DERVEER 1,915,561

TRACTION DEVICE Filed Aug. 31, 1931 flbvsurore M W Patented June 27,1933 PATENT OFFICE RALPH L. VAN DERVEER, OF GENEVA, NEW YORK TRACTIONDEVICE Application filed August 31, 1931. Serial No. 560,404.

.This invention relates to a new and improved traction device.

The main object of my invention is to provide a traction device fortractors and other vehicles which will be not only eilicient inuse,

but which is so constructed that the wearing parts of the device may bereplaced without removing the main body thereof from the felly of awheel.

Another object of my invention is to provide a traction device of such adesign that it may be used on hard roads without danger of injury to theroad. y

Another object is to provide a traction device of such a design thatdifierent sizes and shapes of traction blades may be usedcdepending uponthe terrain on which the vehicle is used. p

Other objects and advantages relate to the size, shape and arrangementof parts, all as will more fully appear fromthefollowing descriptiontaken in connection with the accompanying drawing, in which s Figurel'is an elevation, partially broken away andpartially in section,showing my improved traction device in position on the felly of a wheel.

Figure 2 is a sectionon line 22 of Figure 1. 7 V

Figure 3 is a section on line 33 of Figure 1. I

Figure 4 is a perspective view of a wearing block used on the tractiondevice. Figure 5 is a perspective view of a wearing blade used on thelug Figure 6 is a perspective view of a frame and traction members usedin a modified form of my traction device.

- Figure 7 is a section on line 77 of Figure 6. I

My improved traction device comprises a main shoe 1 formed from achannel iron and having a central aperture as a. In each of the verticalside portions or flanges of the h shoe 1, I provide. a central aperture.

A wearing blade 2 having a central aperture 8 is placed in positionagainst the inner face of each of the vertical sides of the shoe withthe aperture 3 in registration with the aperture in such side.

A wearing block 4: having a square recess as b in communication with aU-shaped recess -c, is placed in position against each of the wearingblades 2 with the recess --c in registration with the aperture 3.

Bolts 5 are inserted through the apertures 1n the sides of the shoe 1and through the apertures 3 in the wearing blades and the recesses c inthe wearing blocks 4, and are threaded into nuts 6 which are positioned1n the recesses -b. and which are held from turning by the wallsof suchrecesses b.

The wearing blades 2 are preferably of the same length as the sides ofthe shoe 1, although they may be shorter or longer as occasion maydemand.

The wearing blades 2 are higher than the sides of the shoe 1 so that thewear will be taken by them and not by the shoe 1.

Referring to Figure 1, it will be noted that the inner faces of thesides ofcthe shoe 1 are tapered inwardly so that when the wearing blades2 are in position they'will be in angular relation to the base of shoe 1with 7 the result that the end of the wearing blades 2 will contact withthe ground at an angle which will cause them to cut into the ground moreeffectually than if they were ina vertical position. 80

It will also be appreciated that when the edges of the wearing plates 2wear down to a sufficient degree to loose their angular biting effect,it is merely necessary to remove such wearing blades and reverse themend to end, and they will again present a sharp edge to the ground.

With this construction, the wearing blades 2 are self-sharpening.

For the purposeof securing the shoe 1 to the felly of a wheel, I providea center block the shoe 1, it issecurely fastened to the wheel felly 11as by bolts 12.

The main body 8 of the center block 7 is sufiiciently long to permitconsiderable play between the shoe 1 and the telly 11 so that as thewheel revolves, the shoe 1 is permitted to rock on'the telly-11. T

When the device is in use, there will be friction between the ends ofthe aperture a and the center block 7, which will tend to enlarge theaperture --abut after a certain amount of wear has taken place, thecenter block 7 will contact with the opposed wearing blocks 4 so thatthey will limit the movement of shoe 1 on the center block 7.

When and if thewearing blocks 4 are Worn down a suflicient amount sothat there is too much play of theshoe 1 on the center block 7, the wornwearing blocks 4 may be removed and new ones placed in the device.

'It will also be apparent that when the wearing blades 2 are-worn downtoa point where they lose any considerable degree of effectiveness, theymay also replaced by new ones.

Under certainconditions, I prefer to equip my device with wearing bladeshaving a certain degree ofresiliency and to effect this result, Iprovide a frame 13 having a central aperture d'and' with apertures 14and 15 in opposite ends of the frame.

In the opposite ends of the-frame 13, I provide parallel clincher slots16 and 17 in which are removablypositioned traction members 18 and-19formed of a material, such asrubber, of some degree of resiliency.

1 ,:The traction members 18 and 19 are remov- 19 carry opposed flangeswhich'snuglyfitthe clincher slots 1.6,and 17. a

- When it is desired to use theframe 13 in my device, the wearing blades2.are removed andtheframe 13 is .placed'in position on the shoe 1 withthe apertures 14 and 15 in registration with theapertures in'the If andwhen the tractionmembers 18 and claims.

19 are worn away so that they lose a conbe removed from frame 13 and newones inserted therein.

It will beunderstood that the length, n

height, and thickness of the wearing blades may be varied as desired" tomeet varying conditions of use, as may the traction members 18 and 19. 7It will also be understood that the size and shape of the shoe may bevaried as may be the size, and shape of the wearing blocks, for'althoughI have shown and described a specific structure and form and relation ofparts as anexemplification of an embodiment of my invention, I donot'desire to restrict myself to the exact size, shape or relation ofparts, as various changes may be made within the scope, of the appended-Iclaim:' w

:1. In a traction device,';a"n apertured shoe having a pair of opposedflanges,'holding means extending through the: aperture of said shoeforsecuring the shoe to the :felly of a wheel to permit rocking of the shoeon said felly, a pair of'wearing blades, means for removably securing abladeto eachflange whereby the blade will extend beyond the s face ofsaid flange and including a wearing block, said block having one edgepositioned adjacent the'aperture to reinforce theshoe and adapted tocontact with the holding means during the rocking of the shoe forpreventing wearing-of the shoe at said aperture by the holding means.

2. In a traction device, an apertured shoe having a pair of opposedflanges, means extendingthrough the aperture of said shoe. for securingthe shoe to the felly of a wheel to permit rocking of the shoe onsaidfelly, a wearing blade adjacent the inner face of each flange, awearing block adjacent each my hand this day of August, 1931. V

RALPH L. VAN DERVEER.

'siderable degree of their efiiciency, they may 7

